750 THE NERVES. 



branch, which, passes over the jugular, near the junction of the glosso-facial, 

 and divides into two ramuscules ; these proceed forward with the glosso- 

 facial vein to the intermaxillary space, where they are distributed to the 

 skin and subcutaneous muscle ; 4, Anastomosing filaments, which unite it 

 to the two branches of the spinal nerve ; 5, Accessory ramuscules to the 

 cervical filament of the facial nerve ; 6, Two communicating branches 

 which pass beneath the rectus anticus major : one going to the first, the other 

 to the third pair of nerves ; 7, A deep branch going to join the precervical 

 filament of the first pair, and directly throwing off some fine divisions to the 

 subscapulo-hyoid muscle ; 8, A last branch that arises at the intervertebral 

 foramen, and passes at first, with the vertebral artery, into the trachelian 

 (posterior) foramen of the second vertebra, and afterwards those of the 

 succeeding vertebrae, to enter the inferior cervical ganglion of the great 

 sympathetic nerve, receiving on its course filaments from the 3rd, 4th, 5th, 

 6th, and 7th pairs. 



Third, fourth, fifth, and sixth. Each of these crosses the intertrans- 

 versales colli by a different interstice to that through which the corresponding 

 superior branch passes. They gain the inner face of the levator humeri, 

 where they divide into deep and superficial ramifications. 



The first are distributed to the deep muscles of the sides and anterior 

 part of the neck and shoulders. Among them ought to be distinguished 

 those which form a communication between the four pairs, and the third 

 with the second. Very long and thin, these filaments lie on the side of the 

 large muscular column formed in front of the cervical stalk by the rectus 

 anticus, longus colli, and scalenus muscles, where they form sometimes arches, 

 and at other times anastomoses by convergence. Those of the fifth and sixth 

 pairs, uniting at the anterior border of the scalenus with a branch of the 

 brachial plexus, constitute the diaphragmatic nerve, which will be noticed 

 hereafter. 



The superficial ramuscules gain the external surface of the levator 

 humeri by traversing its substance, or passing between its two portions. 

 Much more numerous and larger than the preceding, they are distributed, 

 in front, to the subcutaneous muscle of the neck, behind, to the trapezius, or 

 below, to the levator humeri and superficial pectoral. Those passing to the last 

 two muscles are very long and voluminous ; they represent the acromial and 

 clavicular branches of the cervical plexus of Man. It may be remarked that 

 the posterior filaments generally communicate with the spinal accessory, 

 while the anterior ones, in meeting the cervical branch of the facial nerve 

 on the jugular, often give it some anastomosing fibres. 



Seventh. An enormous branch comes from the interstice between the 

 two portions of the scalenus, to pass entirely into the brachial plexus. It 

 usually receives an anastomosing twig from the diaphragmatic filament 

 furnished by the sixth pair. 



Eighth. This is thicker than the preceding, and comports itself like it. 

 It directly furnishes its anastomotic branch to the inferior cervical ganglion. 



ARTICLE II. DORSAL NERVES (17 Pairs). 



These nerves, numbering seventeen pairs, comport themselves in an 

 extremely simple and almost identical manner ; so that their description is 

 not nearly so complicated as that of the nerves of the cervical region. 



SUPERIOR BRANCHES. They present two principal ramuscules destined 

 to the spinal muscles, and to the skin of the dorso-lumbar region. Ono 



